tsearch2 and case

First of all: Happy Independence Day.

I've got a quick question for those with tsearch2 experience.
I set tsearch2 up and it works great (although I'd like to search for phrases
too, but I guess that's not supported at this time).
Anyways, I noted that the search seems to be case sensitive for some search
terms, particularly abbreviations. So if I'm searching with

to_tsquery('ABCD') - where ABCD is a standard abbreviation, I get a lot of
hits, but I get none with to_tsquery('abcd') because the abbreviation is
always upper case in my text.

I'd like the search to be completely case insensitive. Can anyone point me in
the right direction?

Thanks for any help.

UC

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